Intracavity Second Harmonic Generation in Quantum Cascade Lasers in the Telecommunication Range

摘要

We propose and theoretically study the performance of short-wavelength mid-infrared quantum cascade lasers integrated with resonant second-harmonic generation (SHG) cascade. We show the feasibility of SHG in the near infrared range 1.3-1.8 μm with nonlinear susceptibility of ～200 pm/V. Theoretical treatment takes into account higher lying energy levels for intracavity SHG by using the one band model with the 14 band energy-dependent effective mass, which is adapted by the first conduction band structure obtained by the 30 band k·p method. We demonstrate the possibility of modal phase matching in the InGaAs/AlAsSb/InP QC laser which yields the intracavity frequency conversion efficiency of the order of 0.4 mW/W~2.